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  1. <?php
  2. function isValidBraces($line) {
  3.     if (!is_string($line)) {
  4.         throw new InvalidArgumentException("Input must be stirng.");
  5.     }
  6.  
  7.     $braces = array(
  8.         array('[', ']'),
  9.         array('{', '}'),
  10.         array('(', ')')
  11.     );
  12.     $counters = array_fill(0, count($braces), 0);
  13.  
  14.     foreach (str_split($line) as $char) {
  15.     	echo $char . "\r\n";
  16.         for ($i = 0; $i < count($braces); $i++) {
  17.             $counters[$i] += $char == $braces[$i][0];
  18.             $counters[$i] -= $char == $braces[$i][1];
  19.             // closing braces should not be first
  20.             if ($counters[$i] < 0) {
  21.                 return false;
  22.             }
  23.         }
  24.     }
  25.  
  26. 	print_r($counters);
  27.     foreach ($counters as $counter) {
  28.         // number of onpening and closing braces should be the same
  29.         if ($counter > 0)
  30.             return false;
  31.     }
  32.  
  33.     return true;
  34. }
  35.  
  36. echo isValidBraces('[(])') . "\r\n";
  37. ?>
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin
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Standard input is empty
stdout
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[
(
]
)
Array
(
    [0] => 0
    [1] => 0
    [2] => 0
)
1
https://ideone.com/eNOXOU
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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